let node = {
    "bucket_domains": [
      {
        "bucket_id": 13058,
        "domain": "i.huaban.com",
        "status": "NORMAL",
        "updated_at": 1419315911
      }
    ],
    "pager": {
      "page": 1,
      "total": 100,
      "limit": 20	
          } 
}

const { bucket_domain } = node;

// for (const bucket_id of bucket_domain) {
//   console.log(bucket_id);
// }
// while(bucket_domains.length) {
//   const bucket = bucket_domains[0].bucket_id;
//   console.log('bucket:' + bucket);
// }
console.log(bucket_domain);
